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Title: Forward flux sampling calculation of homogeneous nucleation rates from aqueous NaCl solutions

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.5016554· OSTI ID:1512939

We used molecular dynamics simulations and the path sampling technique known as forward flux sampling to study homogeneous nucleation of NaCl crystals from supersaturated aqueous solutions at 298 K and 1 bar. Nucleation rates were obtained for a range of salt concentrations for the Joung-Cheatham NaCl force field combined with the Extended Simple Point Charge (SPC/E) water model. The calculated nucleation rates are significantly lower than the available experimental measurements. The estimates for the nucleation rates in this work do not rely on classical nucleation theory, but the pathways observed in the simulations suggest that the nucleation process is better described by classical nucleation theory than an alternative interpretation based on Ostwald’s step rule, in contrast to some prior simulations of related models. In addition to the size of NaCl nucleus, we find that the crystallinity of a nascent cluster plays an important role in the nucleation process. Nuclei with high crystallinity were found to have higher growth probability and longer lifetimes, possibly because they are less exposed to hydration water.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Grant/Contract Number:
SC0002128; TG-CHE170059
OSTI ID:
1512939
Alternate ID(s):
OSTI ID: 1418078
Journal Information:
Journal of Chemical Physics, Vol. 148, Issue 4; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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Cited By (6)

Calculation of critical nucleation rates by the persistent embryo method: application to quasi hard sphere models journal January 2018
NaCl nucleation from brine in seeded simulations: Sources of uncertainty in rate estimates journal June 2018
Communication: Nucleation rates of supersaturated aqueous NaCl using a polarizable force field journal October 2018
Nucleation in aqueous NaCl solutions shifts from 1-step to 2-step mechanism on crossing the spinodal journal March 2019
Liquid-liquid separation of aqueous solutions: A molecular dynamics study journal June 2019
Seeding approach to bubble nucleation in superheated Lennard-Jones fluids journal November 2019

Figures / Tables (8)


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